osl: Windows pipe converted from OSL_ASSERT to assert/SAL_WARNs

Explanation for each conversion:

- osl_acceptPipe()
- don't worry about an invalid oslPipe sent as function parameter, we
check for the error returned by ConnectNamedPipe(), and without a
valid pipe we just need to return nullptr
- warn if INVALID_HANDLE_VALUE for the file handle, should be handled by
ConnectNamedPipe()
- createPipeImpl() allocates and initializes memory for the
oslPipeImpl structure, if it can't do this then something has been
done wrongly

- osl_receivePipe()
- invalid pipe needs to assert because ResetEvent needs valid
pPipe->m_ReadEvent

- osl_sendPipe()
- invalid pipe needs to assert because ResetEvent needs valid
pPipe->m_ReadEvent

- osl_writePipe()
- really just a thin wrapper around osl_sendPipe()

- osl_readPipe()
- really just a thin wrapper around osl_receivePipe()

Change-Id: I581f8aa996375a8691eafaa384d3f63f0c92b0a2
Reviewed-on: https://gerrit.libreoffice.org/40262
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>

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